Serqet used to sit on the ‘dune’ field before the head lobe sheared from the body lobe. The front perimeter of the field follows the front perimeter of Serqet’s former seating. The dunes are not aeolian in nature because they follow the footprint of Serqet’s bottom perimeter that sat there. They’re probably ripples of slurry that was trapped under Serqet. The field would have been flash-frozen when Serqet lifted off. The lifting off may have actually caused the ripples.
The gif below shows the evidence. It’s followed by the stills that went into making it. The stills are essential for serious study i.e. for zooming in and for clarity. The gif was an experiment that’s good for a quick overview. You should be able to pause it for each still and scroll back and forth as well. But you can’t zoom. Also, the first three components have text that’s more blurred than in the still.
THE STILLS FOR THE GIF IN THE SAME SEQUENCE
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0
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All dotted annotations by A. Cooper.
Copyright: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA/A.COOPER